1 /*
2  * Copyright 2018 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #pragma once
9 
10 // skcms_internal.h contains APIs shared by skcms' internals and its test tools.
11 // Please don't use this header from outside the skcms repo.
12 
13 #include "skcms.h"
14 #include <stdbool.h>
15 #include <stdint.h>
16 
17 #ifdef __cplusplus
18 extern "C" {
19 #endif
20 
21 // ~~~~ General Helper Macros ~~~~
22     #define ARRAY_COUNT(arr) (int)(sizeof((arr)) / sizeof(*(arr)))
23 
24     typedef struct skcms_ICCTag {
25         uint32_t       signature;
26         uint32_t       type;
27         uint32_t       size;
28         const uint8_t* buf;
29     } skcms_ICCTag;
30 
31     void skcms_GetTagByIndex    (const skcms_ICCProfile*, uint32_t idx, skcms_ICCTag*);
32     bool skcms_GetTagBySignature(const skcms_ICCProfile*, uint32_t sig, skcms_ICCTag*);
33 
34     float skcms_MaxRoundtripError(const skcms_Curve* curve, const skcms_TransferFunction* inv_tf);
35 
36     // 252 of a random shuffle of all possible bytes.
37     // 252 is evenly divisible by 3 and 4.  Only 192, 10, 241, and 43 are missing.
38     // Used for ICC profile equivalence testing.
39     extern const uint8_t skcms_252_random_bytes[252];
40 
41 // ~~~~ Portable Math ~~~~
floorf_(float x)42     static inline float floorf_(float x) {
43         float roundtrip = (float)((int)x);
44         return roundtrip > x ? roundtrip - 1 : roundtrip;
45     }
fabsf_(float x)46     static inline float fabsf_(float x) { return x < 0 ? -x : x; }
47     float powf_(float, float);
48 
49 // ~~~~ Does this pixel format need a palette pointer to be usable? ~~~~
needs_palette(skcms_PixelFormat fmt)50     static inline bool needs_palette(skcms_PixelFormat fmt) {
51         return (fmt >> 1) == (skcms_PixelFormat_RGBA_8888_Palette8 >> 1);
52     }
53 
54 #ifdef __cplusplus
55 }
56 #endif
57